RM Synthesis code that could be combined with imaging one day

[Luke-Pratley]

RM measurement operator + example of 1d reconstruction + tests

[codecov-io]

Codecov Report

Merging #262 into development will increase coverage by 0.44%.
The diff coverage is 93.29%.

@@               Coverage Diff               @@
##           development     #262      +/-   ##
===============================================
+ Coverage        86.46%   86.91%   +0.44%     
===============================================
  Files               66       70       +4     
  Lines             6259     6602     +343     
===============================================
+ Hits              5412     5738     +326     
- Misses             847      864      +17

Impacted Files	Coverage Δ
cpp/tests/rm_operator.cc	100% <100%> (ø)
cpp/purify/rm_kernel_integration.cc	100% <100%> (ø)
cpp/purify/rm_operators.cc	70% <70%> (ø)
cpp/purify/rm_operators.h	95.53% <95.53%> (ø)
cpp/purify/kernels.cc	61.17% <0%> (+3.52%)	⬆️

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[Luke-Pratley]

This is ready to merge!

[CosmoMatt]

hey @Luke-Pratley we're tidying up PR's for PURIFY, can you remember what the state of this PR is? It seems as though it's ready to go, provided a few conflicts?

[Luke-Pratley]

@CosmoMatt I think it is fine for it to be merged tbh. It is adjacent to the interferometric imaging, so I am not surprised it is mostly ready to be merged.